铸铁锅炉扩缩通道内对流换热的实验研究

An Experimental Study of Conveetive Heat Transfer in a Converging-Diverging Duct of Cast Iron Sectional Boilers

在实验的基础上,得出了铸铁锅炉烟气流通通道内对流换热系数随烟气流速、锅片厚度及进口段长度的变化规律,烟气流速(?)=3～14m/s,锅片厚度L=150～220mm。该实验结果同光管及前苏联在设计铸铁锅炉时所使用的公式作了比较。其实验结果适合于目前国内生产的多数铸铁锅炉,对铸铁锅炉的设计有指导意义。

Througn experiments the authors have identified the relationship governing the variation of convective heat transfer coefficient in a converging-diverging duct of cast iron sectional boiler with the following parameters: flue gas flow velocity, boiler section thickness and inlet section length. The flue gas is evaluated to have a velocity ranging from 3 to 14 m/s with the section thickness L=150～220mm. The experimental results have been compared with those obtained for bare smooth pipes and also those obtained through the use of the formula adopted by soviet designers for cast iron sectional boilers. The said results are readily applicable to the majority of cast iron sectional boilers currently manufactured in China.